Fix travis credentials.

Author: daspecster

speech/unit_tests/test_client.py

@@ -338,14 +338,24 @@ def speech_api():
         self.assertIsNone(operation.response)
 
     def test_speech_api_with_gax(self):
+        from google.cloud._testing import _Monkey
+
+        from google.cloud.speech import _gax
         from google.cloud.speech.client import GAPICSpeechAPI
 
         creds = _Credentials()
         client = self._makeOne(credentials=creds, use_gax=True)
         client.connection = _Connection()
         client.connection.credentials = creds
 
+        def speech_api():
+            return _MockGAPICSpeechAPI()
+
         self.assertIsNone(client._speech_api)
+
+        with _Monkey(_gax, SpeechApi=speech_api):
+            client._speech_api = _gax.GAPICSpeechAPI(client)
+
         self.assertIsInstance(client.speech_api, GAPICSpeechAPI)
 
     def test_speech_api_without_gax(self):